Sealed 400AP 40 piston set for the 1970-1976 Chevrolet Impala V8 6.6L and other vehicles replaces worn pistons during an engine rebuild. This engine piston set is intended to match the performance and dependability of original equipment pistons and meets or exceeds OEM specifications.
- Sealed Power Vintage line for classic engine rebuilds
- Cast aluminum pistons made from FM132 Eutectic proprietary alloy
- Recessed piston head
- Oversized by 0.040 in
Quick facts
- Part: Sealed 400AP 40 piston set
- Also called: engine piston set
- Fits: 1970-1976 Chevrolet Impala V8 6.6L and other vehicles
- Material: Cast aluminum
Blue exhaust smoke, oil use or lost compression can mean worn pistons or cylinder wear. These signs alone do not prove the pistons are the problem; worn valve stem seals can burn oil too.
Fits
The 1970-1976 Chevrolet Impala V8 6.6L, the 1976-1980 Chevrolet C10 V8 6.6L and the 1976-1980 Chevrolet C20 V8 6.6L take this piston set, and so do many other Chevrolet, GMC and Pontiac models. The Impala V8 takes eight pistons. If your car is not one of those three, find your own year, model and engine in the "Vehicles it fits" section.
Specifications
Fit and size
- Bore diameter: 4.1250 in
- Oversize: 0.040 in
- Compression height: 1.540 in
- Piston pin outside diameter: 0.9275 in (23.559 mm)
- Pin offset: 0.03 in (0.762 mm)
- Top and second compression ring thickness: 0.0781 in
- Oil ring thickness: 0.1875 in
- Quantity per vehicle: 8
Build and materials
- Type: Cast piston set
- Piston material: Cast aluminum
- Alloy: FM132 Eutectic proprietary alloy
- Piston head type: Recessed
- Country of origin: India
In the box
Assembly lubricant is not included.
Interchange: P1546(8)040
P571040 · 91443040 · TC1852040 · 2241852040 · 979P40 · 1443040 · Z8308040
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
P571040, 91443040, TC1852040, 2241852040, P1546(8)040, 979P40, 1443040, Z8308040
Frequently Asked Questions
Does Sealed 400AP 40 fit a 1970-1976 Chevrolet Impala V8 6.6L?
Yes. Sealed 400AP 40 fits the 1970-1976 Chevrolet Impala V8 6.6L, and that V8 takes eight pistons.
How much oversize is the Sealed 400AP 40 piston set?
Sealed 400AP 40 is oversized by 0.040 in and is made for a 4.1250 in bore diameter. The piston pin outside diameter is 0.9275 in (23.559 mm).
What alloy are these cast aluminum pistons made from?
This piston set is cast aluminum, made from FM132 Eutectic proprietary alloy, with a recessed piston head.
Does this piston set come with assembly lubricant?
No. Assembly lubricant is not included with this piston set.
Is 91443040 an interchange number for this piston set?
Yes. 91443040 is listed as an interchange number for Sealed 400AP 40, along with several other cross-reference numbers.
